COT Protection question

Kenny C · 07-02-2007, 02:54 PM

Should I leave this enabled, or should I disable it?

What would disabling do for me? I read a lot about people disabling this, but they don't say why

justin · 07-02-2007, 06:43 PM

What COT protection does is richen up the AFR when the PCM has determined that the temps of the CATs may be at dangerous levels (calculated by airflow, AFR, duration, etc). Typically, it can cause AFRs to richen up excessively at the top of second gear, leaving you deep in the 10s or even 9.x:1. By disabling COT protection, your mixture won't richen up to this power robbing level.

The downside is your catalytic converters probably won't last quite as long as they will otherwise if you're on the throttle a lot.

N0DIH · 07-14-2007, 10:26 PM

I have found on my LT1 the COT seems to operate a LOT more than I like, so I finally bumped up the cat overtemp temps to 900C, never see it running anymore. But I will pulling the cats soon to replace anyway, but many new high perf GM cars are running the 900C temps on the converters.

I don't recommend messing with unless you have no cats or don't care if they melt and get plugged up....

07-02-2007, 02:54 PM	#1
Kenny C Premium Member #1 Supporting Member Status: Offline Join Date: Nov 2005 Member ID: 37025 Pics: My Gallery Location: Sellersburg, IN / Louisville, KY Age: 28 Posts: 1,568	COT Protection question Should I leave this enabled, or should I disable it? What would disabling do for me? I read a lot about people disabling this, but they don't say why '07 Sierra Denali - 6.2l L92, 6L80E, AWD w/3.42s, HPTuners, Innovate LM-1, Volant CAI, 160* t-stat, N-Fabs, 2.5" leveling kit and 285/65/18 Nitto TGs

07-02-2007, 06:43 PM	#2
justin Forum Leader Status: Offline Join Date: Aug 2001 Member ID: 72 Pics: My Gallery Location: Alexandria VA Posts: 4,976	Re: COT Protection question What COT protection does is richen up the AFR when the PCM has determined that the temps of the CATs may be at dangerous levels (calculated by airflow, AFR, duration, etc). Typically, it can cause AFRs to richen up excessively at the top of second gear, leaving you deep in the 10s or even 9.x:1. By disabling COT protection, your mixture won't richen up to this power robbing level. The downside is your catalytic converters probably won't last quite as long as they will otherwise if you're on the throttle a lot. EFI University's EFILive Course Instructor, Black Bear Performance 2003 Silverado SS. Radix. LS6 Cam 2002 Trans Am WS6.

07-14-2007, 10:26 PM	#3
N0DIH Registered User Status: Offline Join Date: Apr 2005 Member ID: 27004 Pics: My Gallery Location: Rockford, IL, just below the cheddar curtain Age: 41 Posts: 1,362	Re: COT Protection question I have found on my LT1 the COT seems to operate a LOT more than I like, so I finally bumped up the cat overtemp temps to 900C, never see it running anymore. But I will pulling the cats soon to replace anyway, but many new high perf GM cars are running the 900C temps on the converters. I don't recommend messing with unless you have no cats or don't care if they melt and get plugged up.... 94 Cadillac Fleetwood Brougham w/RPO V4P 00 Buick Park Avenue Ultra SC 3800 99 K2500 Suburban 454, Tuned by Me! "Though I Fly Through the Valley of Death ... I Shall Fear No Evil. For I am at 80,000 Feet and Climbing." - At the entrance to the old SR-71 operating base Kadena, Japan

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